Update README.md

Author: jimmckeeth

Tutorials/Webinar I/README.md

@@ -7,6 +7,6 @@
 
 - [Video replay](https://youtu.be/aCz5h96ObUM)
 
-- [Slides](https://www.slideshare.net/embarcaderotechnet/python-for-delphi-developers-part-1-introduction)
+- [Slides](Python4Delphi(Part1).pdf)
 
-- Source code included in this folder
+- Source code included in this folder